/**
 * Error utilities and common JSON-RPC error codes used by the MCP paywall.
 */
export declare const ERROR_CODES: {
    readonly Misconfiguration: -32002;
    readonly PaymentRequired: -32003;
};
export type ErrorCode = (typeof ERROR_CODES)[keyof typeof ERROR_CODES];
/**
 * Create a JSON-RPC-like error object preserving numeric code and message.
 * Returns an Error instance augmented with a numeric `code` and optional `data`.
 */
export declare function createRpcError(code: ErrorCode, message: string, data?: any): Error & {
    code: number;
    data?: any;
};
/**
 * Raised by the paywall when payment is required (x402 v2 MCP transport).
 *
 * Carries the spec-shaped `PaymentRequired` object so the tool paywall wrapper
 * can surface it *in band* as a `CallToolResult({ isError: true, ... })`. Also
 * exposes a JSON-RPC `code` so that non-tool paths (resources / prompts), which
 * cannot return a tool-result error, still degrade to a JSON-RPC error when the
 * exception propagates. Note: the MCP SDK's low-level catch-all only forwards
 * the error message (not `code`) to the wire for those paths.
 */
export declare class PaymentRequiredError extends Error {
    paymentRequired: Record<string, any>;
    code: number;
    constructor(paymentRequired: Record<string, any>, message?: string);
}
/**
 * Raised when settlement fails AFTER the tool has already executed.
 *
 * Same in-band shape as {@link PaymentRequiredError}; the tool paywall wrapper
 * suppresses the already-computed tool content and returns only the payment
 * error, per the x402 v2 MCP transport spec ("do not return the tool's content
 * if settlement fails").
 */
export declare class SettlementFailedError extends PaymentRequiredError {
    constructor(paymentRequired: Record<string, any>, message?: string);
}
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